Mechanics

DRIVERS POWER SEAT AND BOTH SEAT HEATERS

2003 GMC Yukon

Electrical problem
2003 GMC Yukon V8 Four Wheel Drive Automatic 88000 miles

My 2003 Yukon has a problem with the drivers side power seat (all functions) and Both power seat heaters not working. These functions worked one day and didn't the next.
This vehicle has the auto recall seats and everything associated with that works except for the seat recall.
I replaced the 30A circuit breaker located under the drivers side inst panel next to the steering column but that did nothing but cost me 14 bucks. The other fuse I checked was a 10 amp per the owners manual and it was fine. I looked at various other fuses and found nothing. I looked under the seat to the best of my ability and really didn't find any bad wires. (There may be some but it is hard to trace). The seat functions of the power passenger seat does work so my problem is exactly with the Drivers Power seat functions and Both seat heaters. Any help is appreciated. If I can save money by not taking it to a dealer and fixing it myself I am certainly willing to shoot some bucks your way. Thanks. Ed
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MOW ED
February 4, 2009.



Follow this info, Some customers may comment that the seat heater and/or memory seat functions are inoperative.

Cause
A logic lockup of the memory seat control module may cause this condition. If the seat is currently inoperable, perform the following diagnostic steps to determine if replacement of the memory seat control module is the correct repair: Connect a Tech 2 to the vehicle and monitor the parameters in the sensor data list for the driver seat module as you try to move the seat. Are the displayed data parameters changing, or does the Tech 2 display no communication as the seat switch is moved to various positions? If the data parameters do not change, the memory seat control module may be inoperative due to a logic lockup.
Remove the SEAT circuit breaker in the instrument panel relay block located under the left side of the instrument panel next to the parking brake. This circuit breaker also supplies power to the passenger seat.
Verify that the circuit breaker is not open. If it is not open, wait 30 seconds and then reinstall the circuit breaker.
Try to move the seat again.
If the seat moves or the data parameters displayed on the Tech 2 change when the seat switch is activated, replace the memory seat control module. Use the Memory Seat Control Module Replacement procedure If the memory seat is still inoperative, use normal Service Manual diagnostics to determine the cause of this condition. Follow this info and post back with what you find.

Brian 1
Feb 4, 2009.
There's two nuts that need to be removed under the driver's side front seat, once removed the seat comes loose, disconnect some of the wiring and you'll see a black box, that is your module

Tiny
Mac9955
Feb 27, 2009.